MTV News' Josh Horowitz will be manning the carpet, chatting with fan favorites Daniel Radcliffe, Rupert Grint, Emma Watson, Alan Rickman, Tom Felton, Matthew Lewis, Helen McCroy and director David Yates among others. Fans can submit their questions for the stars via MTV.com or Twitter (tweet @MTVNews using the hashtag #AskPotter) starting now and throughout the live stream, which kicks off at 4:30 p.m. ET on MTV.com.

Over 5 million votes have been cast so far, and there are still three more rounds of voting to go. The Elite Eight were announced on Wednesday morning (July 6): Harry Potter vs. Severus Snape, Hermione Granger vs. Remus Lupin, Ron Weasley vs. Rubeus Hagrid and Draco Malfoy vs. Sirius Black. Voting for this round will continue through Thursday at midnight, when the Final Four will be announced.

World Cup voting for the Final Four continues through midnight on Sunday, and then the final two favorite "Harry Potter" characters battle it out during the championship round until the winner is announced live. With five out of the Elite Eight actors attending the premiere, there's a good chance we'll be able to chat with the stars about how far their characters made it in the World Cup.

Now it's up to the fans to decide who the ultimate "Harry Potter" character is in the "Harry Potter" World Cup. Voting continues over at MTV Movies Blog and you can also get the debate going on Twitter with the hashtag #mtvpottercup